Question

2.5 kg of potatoes cost £1.40
Work out the cost of 4.25 kg of potatoes.

Answer 1

Step-by-step explanation:

if 2.5kg=£1.40

then 4.25kg=!

then cross multiply

4.25×1.40=2.5

5.95÷2.5kg=£2.38

Answer 2

Answer:

4.25 kg = £2.38

Step-by-step explanation:

The formula for working out the price per quantity is : $\frac{Price}{Amount}$

To work this out you would first need to convert the mass of 2.5 kilograms into grams. You can do this by multiplying 2.5 by 1000, this gives you 2500 grams. This is because 1 Kg is equivalent to 1000 g and so by multiplying it by 1000 we are converting the kilograms into grams.

Then the next step is to divide the price of £1.40 by the quantity of 2500, this gives you 0.00056. This is because we are working out how much it costs for 1 g of potatoes.

Now that we know the price per gram we can now start working out the price of 4.25 kg. You can do this by first multiplying the mass of 4.25 kg by 1000, this gives you 4250. This is because we are converting the kilograms into grams.

The final step is to multiply the price per gram which is 0.00056 by 4250, this gives you £2.38.

1) Multiply 2.5 by 1000.

$2.5*1000=2500$

2) Divide 1.40 by 2500.

$1.40/2500=0.00056$

3) Multiply 4.25 by 1000.

$4.25*1000=4250$

4) Multiply 0.00056 by 4250.

$0.00056*4250=2.38$